Can I build or get Android 4.2 or lower image on the Riotboard?

you can build android from source for Riot

refer this blog by otto.

You can follow the instructions in my blog like tusharp said.

But If you want to compile Android 4.2 you have to change the manifest when checking out the files with repo.

Instead of "-m embest_android_jb4.3_1.0.0" you´d have to use "-m embest_android_jb4.2.2_1.1.0".

But I don´t think that compiling Android 4.2 alone will get your USB 3G dongle working. You´d have to integrate the right driver and then compile.

the USB 3g needs to have supported drivers either in kernel or in android userspace to get it working.

check in the vendor website for the supported drivers.

would like to check if any open source drivers support is there for the 3g dongle

plz share your USB 3g dongle details..

Dear Tushar Panda,

     I used PPP Widget to try to connect to 3G and plug USB dongle to get these message from console as below, PPP Widget always show "No modem found".

ehci_fsl_bus_suspend begins, Host 1

ehci_fsl_bus_suspend ends, Host 1

ehci_fsl_bus_resume begins, Host 1

ehci_fsl_bus_resume ends, Host 1

usb 2-1.2: new full speed USB device number 7 using fsl-ehci

scsi8 : usb-storage 2-1.2:1.0

usb 2-1.2: USB disconnect, device number 7

usb 2-1.2: new full speed USB device number 8 using fsl-ehci

option 2-1.2:1.0: GSM modem (1-port) converter detected

usb 2-1.2: GSM modem (1-port) converter now attached to ttyUSB0

option 2-1.2:1.1: GSM modem (1-port) converter detected

usb 2-1.2: GSM modem (1-port) converter now attached to ttyUSB1

scsi11 : usb-storage 2-1.2:1.2

scsi 11:0:0:0: CD-ROM            HUAWEI   Mass Storage     2.31 PQ: 0 ANSI: 2

Then I checked PPP Widget website and found

Attention: Android 4.3 has changed the kernel so that loading driver modules is disabled. Nexus 7 Old still has modem drivers enabled in the kernel, but Nexus 7 New (Wifi) and Nexus 10 don't. Since there is no more way to add drivers, USB modems cannot be used with these devices anymore. Blame Google for this.

This topic is gotten from http://www.draisberghof.de/android/pppwidget.html

If I use Android 4.3, I can bind another module to solve this issue or build Android 4.2 or lower?

Sincerely

Ken

loading driver modules is disabled

They don't permit userspace drivers.

so you need to recompile kernel and bind the module with the appropriate drivers (y option) to get your dongle working.

once plugged in detect the  VID:PID by lsusb.

with VID:PID you can search for any existing drivers.

You mean I build Android 4.3 and bind the module should solve this issue, am I right?

I mean you need to build the kernel with supported drivers (either vendor provided or available in open source) to get the device up.

once the device is up, then maybe (as author claims) the widget will be able to detect it.

can't say if it will solve the issue or not , but definitely the drivers will provide hardware interface ,  just need to hookup with a supported app.